Rotary pump



1961 A. P. STERlTl 2,995,093

ROTARY PUMP Filed Aug. 21, 1959 2 Sheets-Sheet 1 JNVENTOR.

ANTHONY D. JTEE/T/ A TTOE/VE'YS' 2,995,093 ROTARY PUMP Anthony P.Steriti, 938 Broadway, Chelsea, Mass. Filed Aug. 21, 1959, Ser. No.835,258 3 Claims. (Cl. 103132) The present invention relat s to a rotarypump of the type having an eccentric slidable on the inner wall of acylinder between an inlet and an outlet.

Previously proposed and presently in use are rotary pumps of theeccentric type employing an eccentrically mounted rotor on a drivenshaft which rolls along the inner wall of a casing or cylinder betweenan inlet and an outlet, the rolling or sliding of the rotor serving todrive fluid from the inlet to the outlet. Such rotary pumps as have beenproposed or are in use present problems in lubricating the same andrequire periodic attention so that the parts thereof do not wear due tolack of lubrication. Additionally, such pumps as are in use requirecheck valves or manually operable valves between their inlets andoutlets in order to prevent backflow of the liquid being pumped when thepump is inoperative.

An object of the present invention is to provide a rotary pump havingsealed lubricating means requiring no attention after installation ofthe pump.

Another object of the present invention is to provide a rotary pumpwhich has positive means for checking the flow of the liquid pump fromthe outlet to the inlet when the pump is not running.

A further object of the present invention is to provide a rotary pumphaving a minimum of parts, one having long life characteristics, onesturdy in construction and of simple structure, and one which iseconomically feasible.

These and other objects and advantages of the present invention will befully apparent from the following description taken in conjunction withthe annexed drawings, in which:

FIGURE 1 is an elevational view of the rotary pump of the presentinvention showing it operatively connected to a motor, only a portion ofthe motor being shown,

FIGURE 2 is a view on an enlarged scale, taken on the line 22 of FIGURE1, with the valve or valve element in closed position,

FIGURE 3 is a view taken on the line 3-3 of FIG- URE 2,

FIGURE 4 is a view similar to FIGURE 2 showing the valve or valveelement in open position, and

FIGURE 5 is an isometric exploded view of the rotary pump according tothe present invention.

Referring in greater detail to the drawings in which like numeralsindicate like parts throughout the several views, the rotary pump of thepresent invention is designated generally by the reference numeral andis shown in FIGURE 1 with its driven shaft 12 connected to the driveshaft 14 of a motor 16, the motor 16 being only partially shown.

The pump 10 comprises a casing .18 having a peripheral wall 19 and twoend walls or sections 74 and 80, the wall 19 having an inlet 22 adaptedto be connected to a source of fluid and having an outlet disposed inopposed relation with respect to the inlet 22.

A closed ended hollow cylinder 24 is positioned within the casing 18intermediate the outlet 20 and inlet 22 and is provided with an opening26. A portion of the periphery of the cylinder 24, as at 28 in FIGURE 2,is in abutting relation with the inner wall of the casing 18. Theopening 26 is in an opposed portion of the periphery of the cylinder 24and is intermediate the outlet 20 and inlet 22 of the casing 18. Theremainder portion of the periphery of the cylinder 24 on each side ofthe portion 28 is spaced from the inner wall of the casing 18 and Withthe inner wall of the casing 18 forms a chamber designated A, FIGURES 2and 4.

The cylinder 24 is closed at one end by a rotatable disc 30 and on theother end by another rotatable disc 32. A driven shaft 34 projects fromone face of the disc 30 and a stub shaft 36 projects from the other faceof the disc 30. A sleeve 38 is circumposed about the stub shaft 36 andis carried on one face of the disc 32, as shown most clearly in FIGURE3, the sleeve 38 being pinned to the stub shaft 36 to be subsequentlydescribed.

An eccentric, designated generally by the reference numeral 40, ismounted on the sleeve 38 which rotates with the stub shaft 36 carried bythe rotatable disc 30, the eccentric being disposed within the cylinder24 so that a portion of its periphery is contiguous to the inner wall ofthe cylinder 24, the eccentric forming with said cylinder 24 the pumpingchamber 41.

The eccentric 40 consists in a cylindrical member 42 having open endsand having the ends closed by closure members 44 and 46.

Packing 48, constituting a sealing means, is interposed between theconfronting ends of the closure members 44 and 46 and adjacent parts ofthe cylindrical member 42, as shown most clearly in FIGURE 3. The stubshaft 36 is provided with an axially arranged threaded bore 52 receivingtherein the shank of a bolt 54. The bolt 54 extends through a holeprovided in the disc 32 and is positioned so that its head is receivedin a recess 56 provided in the disc 32.

The sleeve 38 is provided with a pair of opposed notches in its freeend, as at 58 in FIGURE 5, the notches 58 receiving a key element 60extending through a bore 62 provided in the stub shaft 36. A circularplate 64 covers the face of the one disc 32 remote from the sleeve 38and is demountably secured thereto by means of a plurality of spacedpins 66. A shaft 68 projects from the face of the plate 64 remote fromthe disc 32.

Other sealing means in the form of packing 70 is circurnposed about theshaft 68 and is held in place by a cap 72 which is bolted to the casingend section 74. Other packing 76 is similarly circumposed about theshaft 34 and is secured in place by another cap 78 bolted to the casingin section 80.

The stub shaft 36 and sleeve 38 constitute a means by which theeccentric 40 is connected to the shaft 34 so that the eccentric 48'executes planetary movement about the inner wall of the cylinder 24while maintaining sealing contact with said inner wall responsive torotation of the shaft 34.

A plate member extends across the chamber A, FIGURES 2 and 4, andsubdivides the chamber A into an inlet fluid chamber 23 and an outletfluid chamber 21. Specifically, the plate member 85 is of L-shape andsuch member is positioned Within the chamber A so that the long leg 8(is within and extends across the chamber A with the short leg 87extendable into and withdrawable from the cylinder opening 26. Meansconnects the plate member 85 or the long leg 86 of the member 85 to thecasing 18 for limited rotational movement of the plate member or longleg thereof. Specifically, this means comprises a bar 84, FIGURE 5,which has its mid-portion secured to the free end of the long leg 86 ofthe bar member 85. The end portions of the bar 84 extend into housings88 and 90 projecting exteriorly of the end sections 74 and 80,respectively, of the casing 18. Suitable packing and sealing means isinterposed between the end portions of the bar 84 and the housings 88and 90, such packing being similar to the packing heretofore describedwith reference to the shaft 34 and shaft 68 and not being illustrated indetail. The housings 88 and 90 support the bar 84 for limited rotationalmovement.

A valve element 82 is positioned adjacent the opening 26 of the cylinder24 and is movable between open and closed positions with respect to theopening 26. Means is provided connecting the plate member 85 or theshort leg 87 of the member 85 to the valve element 82 and to theeccentric 40 so that the valve element 82 will move between opening andclosing. positions relative to the opening 26 in the cylinder 24responsive to execution of planetary movement of the eccentric 44 whilethe latter maintains sealing contact with the inner wall of the cylinder24. Specifically, this means comprises a pair of spaced trunnion members92 and 94 fixedly secured to the eccentric 40 and a stub shaft 96 havingthe portions adjacent each end journaled in the trunnion members 92 and94, the stub shaft 96 being carried by the end of the plate member 86remote from the bar 84. The stub shaft 96 has a mid part 98 ofsubstantially the same size as the trunnion members 92 and 94 and withthe trunnion members 92 and 94 the mid part 98 forms the portion of thevalve element 82 movable between the open position and the closedposition relative to the cylinder opening 26.

Each of the trunnion members 92 and 94 is provided with sealing means orpacking 100 secured in place by a closure member 102 constituting apacking gland inserted into the open end of the trunnion member 92 or 94through the end remote from the mid part 98 of the stub shaft 96. Bolts104 secure each trunnion member 92 and 94 to the adjacent part of theeccentric 40 which is provided with a shallow arcuate groove, as at 106and shown most clearly in FIGURE 5.

The mid part 93 of the stub shaft 96 is fixedly secured by welding orother suitable means to the free end of the plate member =86.

An adjustable lip member 108 isremovably secured by cap screws 110 tothe portion of the cylinder exteriorly of and adjacent the opening 26for adjusting the size of the opening 26 relative to the effectivediameter of the valve element 82.

Suitable bolts 112 secure the closure members 44 and 46 to thecylindrical member 42 and other bolts 114 secure the casing sections 74and 8% to the cylindrical element 116 which constitutes the body of thecasing 18.

It is to be noted that the cylinder 24 is in sealing contact with theinner surface of the peripheral wall 19 of the casing \18 at a point onone side of a plane through the casing inlet 22 and outlet 20 while theplate member 85 is in sealing contact with the casing peripheral wall 19at a point on the diametrically opposite side of said plane through theinlet 22 and outlet 21' Also, the valve element 82 has sealing contactwith the plate member 85 and cylinder 24 over their entire length. Inaddition, the eccentric 40 is prevented from rotating as it executes itsplanetary movement, and the cylinder 24, plate member 85, valve element82 and eccentric 40, are all of a length such that their ends are insealing contact with the casing end walls 74 and 80.

In operation, upon energization of the motor 16 the shaft 12 will rotatein the clockwise direction as viewed in FIGURES 2 and 4. With the inlet20 connected to a source of fluid to be pumped, the eccentric 46 uponexecution of a part of its planetary movement within the cylinder 24shifts the valve element 82 from the closed position, FIGURE 2, towardand to the open position of FIGURE 4, and permits the flow of fluid fromthe inlet fluid chamber 23 through the cylinder opening 26 into, around,and out of the pumping chamber '41, and into the outlet fluid chamber21, andthence out of the outlet 20 of the casing 18, and the eccentric40 upon execution of the remaining part of its planetary movement withinthe cylinder 24 shifts the valve element from the open position, FIGURE4, toward and to the closed position of FIGURE 2, and closes thecylinder opening 26 and prevents the flow of fluid from the inlet fluidchamber 23 into the pumping chamber 41 and from the pumping chamber 41to the outlet fluid chamber 21.

It is understood that the plate member 86 is of a size and width tocompletely bridge the chamber formed between the inlet 20 and the outlet22.

Positive lubrication is assured by the provision of the packing 48, 70,76, and and trouble-free operation is easily obtained in the rotary pumpof the present invention due to the arrangement of such packing and theassociated gland members or closure members holding such packing inplace.

What is claimed is:

1. A rotary pump comprising a cylindrical casing having a peripheralwall and two end Walls, the Wall of said casing having an inlet adaptedto be connected to a source of fluid and having an outlet disposed inopposed relation with respect to said inlet, a hollow cylinder closed ateach end by a rotatable disc fixedly positioned within said casingintermediate said inlet and said outlet and forming with said casing afluid chamber, said cylinder being provided with an opening intermediatesaid casing inlet and outlet, a plate member extending across saidchamber and subdividing said chamber into an inlet fluid chamber and anoutlet fluid chamber, means connecting said plate member to said casingfor limited rotational movement of said plate member, said cylinderbeing in sealing contact with the inner surface of said peripheral wallof said casing at a point on one side of a plane through said casinginlet and outlet while said plate member is in sealing contact with saidcasing peripheral wall at a point on the diametrically opposite side ofsaid plane through said inlet and outlet, a driven shaft projectingaxially from one of said rotatable discs, an eccentric housed Withinsaid cylinder and forming with said cylinder a pumping chamber, meansconnecting said eccentric to said shaft so that said eccentric executesplanetary movement about the inner wall of said cylinder whilemaintaining sealing contact With said Wall responsive to the rotation ofsaid shaft, a valve element positioned adjacent said cylinder opening,said valve element having sealing contact with said plate member andsaid cylinder over their entire length, and means connecting said platemember to said valve element and to said eccentric so that said valveelement will move between opening and closing positions relative to saidopening responsive to execution of planetary movement of said eccentricwhile the latter maintains sealing contact with the inner wall of saidcylinder and is prevented frorn rotating, said cylinder, plate member,valve element and eccentric being all of a length such that their endsare in sealing contact with said casing end walls, said eccentric uponexecution of a part of its planetary movement shifting said valveelement from the closed position toward and to the open position andpermitting the flow of fluid from the inlet chamber through the cylinderopening, into, around, and out of the pumping chamber, and into theoutlet chamber, and upon execution of the remaining part of itsplanetary movement shifting said valve element from the open positiontoward and to the closed position and closing the cylinder opening andpreventing the flow of fluid from the inlet chamber into the pumpingchamber and from the pumping chamber into the inlet chamber.

2. A rotary pump comprising a cylindrical casing having a peripheralwall and two end walls, the wall of said casing having an inlet adaptedto be connected to a source of fluid and having an outlet disposed inopposed relation with respect to said inlet, a hollow cylinder closed ateach end by a rotatable disc fixedly positioned within said casingintermediate said inlet and said outlet and forming with said casing afluid chamber, said cylinder being provided with an opening intermediatesaid casing inlet and outlet, a plate member extending across saidchamber and subdividing said chamber into an inlet fluid chamber and anoutlet fluid chamber, means connection said plate member to said casingfor limited rotational movement of said plate member, said cylinderbeing in sealing contact with the inner surface of said peripheral wallof said casing at a point on one side of a plane through said casinginlet and outlet while said plate member is in sealing contact with saidcasing peripheral wall at a point on the diametrically opposite side ofsaid plane through said inlet and outlet, a driven shaft projectingaxially from one of said rotatable discs, an eccentric housed withinsaid cylinder and forming with said cylinder a pumping chamber, meansconnecting said eccentric to said shaft so that said eccentric executesplanetary movement about the inner wall of said cylinder whilemaintaining sealing contact with said wall responsive to the rotation ofsaid shaft, means on said cylinder adjacent said cylinder opening andshiftable relative to said opening for adjusting the size of saidopening, a valve element positioned adjacent said cylinder opening, saidvalve element having sealing contact with said plate member and saidcylinder over their entire length, and means connecting said platemember to said valve element and to said eccentric so that said valveelement will move between opening and closing positions relative to saidopening responsive to execution of planetary movement of said eccentricwhile the latter maintains sealing contact with the inner wall of saidcylinder, and is prevented from rotating, said cylinder, plate member,valve element and eccentric being all of a length such that their endsare in sealing contact with said casing end walls, said eccentric uponexecution of a part of its planetary movement shifting said valveelement from the closed position toward and to the open position andpermitting the flow of fluid from the inlet chamber through the cylinderopening, into, around, and out of the pumping chamber, and into theoutlet chamber, and upon execution of the remaining part of itsplanetary movement shifting said valve element from the open positiontoward and to the closed position and closing the cylinder opening andpreventing the flow of fluid from the inlet chamber into the pumpingchamber and from the pumping chamber into the outlet chamber.

3. A rotary pump comprising a cylindrical casing having a peripheralwall and two end walls, the wall of said casing having an inlet adaptedto be connected to a source of fluid and having an outlet disposed inopposed relation with respect to said inlet, a hollow cylinder closed ateach end by a rotatable disc fixedly positioned within said casingintermediate said inlet and said outlet and forming with said casing afluid chamber, said cylinder being disposed within the casing so thatthe peripheral portion is in engagement with the inner Wall of saidcasing, there being an opening in said cylinder intermediate the casinginlet and outlet, an L-shaped plate member positioned within said casingso that the long leg is within and extends across said chamber with theshort leg extendable into and withdrawable from the cylinder opening andsubdividing said chamber into an inlet fluid chamber and an outlet fluidchamber, means connecting the long leg of said plate member to saidcasing for limited rotational movement of said plate member, saidcylinder being in sealing contact with the inner surface of saidperipheral wall of said casing at a point on one side of a plane throughsaid casing inlet and outlet while said plate member is in sealingcontact with said casing peripheral wall at a point on the diametricallyopposite side of said plane through said inlet and outlet, a drivenshaft projecting axially from one of said rotatable discs, an eccentrichoused within said cylinder and forming with said cylinder a pumpingchamber, means connecting said eccentric to said shaft so that saideccentric executes planetary movement about the inner Wall of saidcylinder While maintaining sealing con-tact with said wall responsive tothe rotation of said shaft, a valve element positioned adjacent saidcylinder opening, said valve element having sealing contact with saidplate member and said cylinder over their entire length, meansconnecting the short leg of said plate member to said valve element andto said eccentric so that said valve element will move between openingand closing positions relative to said opening responsive to executionof planetary movement of said eccentric while the latter maintainssealing contact with the inner wall of said cylinder and is preventedfrom rotating, said cylinder, plate member, valve element, and eccentricbeing all of a length such that their ends are in sealing contact withsaid casing end walls, said eccentric upon execution of a pant of itsplanetary movement shifting said valve element from the closed positiontoward and to the open position and permitting the flow of fluid fromthe inlet chamber through the cylinder opening into, around, and out ofthe pumping chamber, and into the outlet chamber, and upon execution ofthe remaining part of its planetary movement shifting said valve elementfrom the open position toward and to the closed position and closing thecylinder opening and preventing the flow of fluid from the inlet chamberinto the pumping chamber and from the pumping chamber into the outletchamber.

References Cited in the file of this patent UNITED STATES PATENTS

